The fourth season of this crime drama begins with Finch (Michael Emerson), Reese (Jim Caviezel), Shaw (Sarah Shahi) and Root (Amy Acker) adapting to new identities created to protect them from Samaritan. However, the Machine continues to send out numbers, which puts their cover in jeopardy. Still, they continue investigating the numbers and the people attached to them, even while Samaritan grows stronger.